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    <style>
        *{
            margin: 0;
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        html,body{
            width: 100%;
            height: 100%;
            background: lightblue;
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        div{
            width:700px;
            height: 100px;
            position: absolute;
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    <h1>恭喜您删除成功!<span id="count" style="color: orangered;font-size: 36px" >04</span>秒后跳回后台管理系统...</h1>
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    /**
     * Created by Administrator on 2017/6/8 0008.
     */
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